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SOLAR/1040-79/05
Monthly
Performance
Report
SADDLE HILL TRUST
LOT 77
MAY 1979
U.S. Department of Energy
National Solar Heating and
Cooling Demonstration Program
National Solar Data Program
NOTICE
This report was prepared as an account of work sponsored by the United States
Government. Neither the United States nor the United States Department of Energy, nor
any of their employees, nor any of their contractors, subcontractors, or their employees,
make any warranty, express or implied, or assume any legal liability or responsibility for
the accuracy, completeness or usefulness of any information, apparatus, product or
process disclosed, or represents that its use would not infringe privately owned rights.
MONTHLY PERFORMANCE REPORT
SADDLE HILL TRUST
LOT 77
MAY 1979
I. SYSTEM DESCRIPTION
Saddle Hill Trust Lot 77 is a single-family residence in Medway, Massachusetts.
Solar energy is used for preheating incoming city water. The solar energy
system has an array of flat-plate collectors with a gross area of 78 square
feet. The array faces south at an angle of 38 degrees to the horizontal. Air
is used as the medium for delivering solar energy from the collector array to
an air-to-liquid heat exchanger located in the collector air duct. Water is
the medium used to transport solar energy from the heat exchanger to storage.
Solar energy is stored in the basement in a 120-gallon preheat storage tank.
This preheated city water is supplied, on demand, to a conventional 40-gallon
domestic-hot-water (DHW) tank. When solar energy is insufficient to satisfy
the hot water requirements, the gas-driven DHW heater provides auxiliary
energy for water heating. The system, shown schematically in Figure 1, has
two modes of solar operation.
Mode 1 - Col lector- to-Storage : This mode activates when the difference-be-
tween the temperature of the collector air and the temperature of the water in
the preheat tank exceeds 40°F and the temperature of the water in the tank is
below 140°F. Both the fan and pump go on. This mode continues until the
temperature difference drops to 20°F.
Mode 2 - Storage-to-Space Heating : This mode activates when there is a demand
for hot water. Hot water from the top of the preheat tank is transferred to
the DHW tank to replace water removed. Simultaneously, city water is auto-
matically supplied to the preheat tank.
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II. PERFORMANCE EVALUATION
INTRODUCTION
The site was occupied in May and the solar energy system operated continuously
during the month. Total solar energy collected was 1.0 million Btu and the
total solar energy used was 0.72 million Btu or 72 percent of the collected
energy. Solar energy satisfied 35 percent of the DHW requirements. The
solar energy system provided a fossil fuel energy savings of 1.1 million
Btu and incurred an electrical energy expense of 0.14 million Btu.
WEATHER CONDITIONS
During the month, total incident solar energy on the collector array was
3.2 million Btu for a daily average of 1315 Btu per square foot. This was
below the estimated average daily solar radiation for this geographical
area during May of 1502 Btu per square foot for a south-facing plane with a
tilt of 38 degrees to the horizontal. The average ambient temperature
during May was 61°F as compared with the long-term average for May of 59°F.
THERMAL PERFORMANCE
System - During May the solar energy system performed approximately the
same as expected. The expected performance was determined from a modified
f-chart analysis using measured weather and subsystem loads as input.
Solar energy used by the system was estimated by assuming that all energy
collected would be applied to the load. Actual solar energy used was 0.72
million Btu versus an estimated 0.77 million Btu. System total solar
fraction was 35 percent versus an estimated 38 percent.
Collector - The total incident solar radiation on the collector array for
the month of May was 3.2 million Btu. During the period the collector loop
was operating, the total insolation amounted to 2.8 million Btu. The total
collected solar energy for the month of May was 1.0 million Btu, resulting
in a collector array efficiency of 32 percent, based on total incident
insolation. Operating energy required by the collector loop was 0.14
million Btu.
DHW Load - The DHW subsystem consumed 0.72 million Btu of solar energy and
2.2 million Btu of auxiliary fossil fuel energy to satisfy a hot water load
of 1.7 million Btu. The solar fraction of this load was 35 percent.
Losses from the DHW subsystem were 0.34 million Btu. A daily average of 75
gallons of DHW was consumed at an average temperature of 139°F delivered
from the tank.
OBSERVATIONS
No significant observations to report.
ENERGY SAVINGS
The solar energy system provided fossil fuel energy savings of 1.1 million
Btu, while incurring an electrical energy expense of 0.14 million Btu.
III. ACTION STATUS
No significant items pending,
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